<template>
    <div>
        <city-header ></city-header>
        <city-search :cities="cities"></city-search>
        <city-list 
            :cities="cities" 
            :hot="hotCities" 
            :letter="letter"></city-list>
        <city-alphabet :cities="cities" @change="handleLetterChange"></city-alphabet>
    </div>
</template>

<script>
import axios from  'axios'
import CityHeader from './components/Header'
import CitySearch from './components/Search'
import CityList from './components/List'
import CityAlphabet from './components/Alphabet'
export default{
    name: 'City',
    data () {
        return {
            cities: {},
            hotCities: [],
            letter: ''
        } 
    },
    components: {
        CityHeader,
        CitySearch,
        CityList,
        CityAlphabet
    },
    mounted () {
        this.getCityInfo();
    },
    methods : {
        getCityInfo (){
            axios.get('/api/city.json')
            .then(this.handleGetCityInfoSucc)
        },
        handleGetCityInfoSucc (res) {
            res= res.data;
            if(res.ret && res.data){
                const data = res.data
                this.cities = data.cities 
                this.hotCities = data.hotCities
            }
        },
        handleLetterChange (letter) {
            //接受子组件的数据
            this.letter = letter;
            //然后传入给list页面，list页面有监听器，监听letter变化，所以导致执行
        }
    }
}  
</script>

<style lang="stylus" scoped>

</style>